Offline AC/DC 77W Quasi-Resonant Flyback Converter Reference Design


Design files


The PMP10121 reference design uses the UCC28600 quasi-resonant flyback controller to generate 22V @ 3.5A from an AC input. This flyback converter is not isolated and no optocoupler is needed for regulation.

  • Quasi-Resonant Flyback Topology
  • Four Point Average Efficiency  = 90.3% (Vin=230VAC)
  • 10% Load Efficiency = 89% (Vin=230VAC)
  • No Need For an Optocoupler
  • This reference design was built and tested and the test report is included
Output voltage options PMP10121.1
Vin (Min) (V) 165
Vin (Max) (V) 275
Vout (Nom) (V) 22
Iout (Max) (A) 3.5
Output Power (W) 77
Isolated/Non-Isolated Non-Isolated
Input Type AC
Topology Flyback- Quasi Resonant
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUAD3.PDF (1453 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDRG82.PDF (311 K)

Detailed schematic diagram for design layout and components

TIDRG83.PDF (136 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRG84.ZIP (383 K)

Files used for 3D models or 2D drawings of IC components


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC286008-pin quasi resonant Flyback green mode controller

Data sheet: PDF | HTML
Shunt voltage references

LMV431A1%, low-voltage (1.24-V) adjustable precision shunt regulator

Data sheet: PDF

Technical documentation

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Type Title Date
* Test report PMP10121 Test Results Jul. 31, 2015

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